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Hurricane Season 2006: Daniel (Eastern Pacific)
07.19.06
 
Daniel Has Dissipated in the Eastern Pacific

What was once Hurricane Daniel is now a memory, according to the National Oceanic and Atmospheric Administration's Central Pacific Hurricane Center (CPHC), at 4:00 a.m. Hawaii Standard Time on Thursday, July 27, 2006.

Daniel is officially defunct in the Central Pacific Ocean. The CPHC said that isolated cumulonimbus clouds (large puffy clouds that form thunderstorms) have begun to form along the northern edge of defunct tropical depression Daniel. These cumulonimbus clouds are about 450 miles east-southeast of the big island of Hawaii and appear to be moving west at about 12 knots (13 mph). Even though Daniel isn't a tropical system anymore, some of the clouds may build to thunderstorms which could affect the main Hawaiian islands through Saturday, July 29.

The National Weather Service forecast for Honolulu, Hawaii Thursday through Saturday, July 27-29, calls for sunshine and a few clouds with isolated showers each day, and highs in the mid 80s. The east winds will run up to 15 mph on Thursday, up to 20 mph on Friday, and down to 15 mph on Saturday the 29. Caption credit: Rob Gutro/ Goddard Space Flight Center

Tropical Depression Daniel Heads for Hawaii

Daniel, once a powerful hurricane and currently in the central Pacific Ocean was downgraded to a tropical depression as of July 25 at 11:00 p.m. HST (July 26 at 5:00 a.m. EDT).

Where is Daniel on July 26?

At 5 a.m. EDT (11:00 p.m. HST) the center of Tropical Depression Daniel was located near latitude 16.3 north and longitude 142.9 west. This places Daniel's center about 835 miles east-southeast of Hilo, Hawaii and about 1040 miles east-southeast of Honolulu, Oahu. The depression was moving toward the west near 2 mph and this motion is expected to become west northwest and increase slightly over the next 24 hours. Maximum sustained winds are near 35 mph with higher gusts. Little change in strength is forecast during the next 24 hours. Estimated minimum central pressure is 1008 millibars.

High Surf Advisory in Effect

The National Weather Service in Honolulu issued a high surf advisory in effect until 6 a.m. HST Thursday, July 27. Surf along the east facing shores will be around 6 to 10 feet through early Thursday. Beachgoers have been warned to stay out of the water and well away from the shore break due to these hazardous waves and strong rip currents.

What Else is in Store for Hawaii?

According to the Central Pacific Hurricane Center's Forecast Discussion on July 25, the mechanism in the atmosphere to create more moisture is limited, so that will limit the threat of excessive rainfall along Daniel's track. The report also states that the potential to strengthen Daniel after he reaches the warmer water of the Hawaiian Islands is severely limited.

This Image of Daniel as a Hurricane on July 21

Hurricane Daniel taken by the Aqua satellite on July 21, 2006.


This image was captured on July 21, 2006, by the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument on NASA’s Aqua satellite. At this time, Daniel was a hurricane, packing sustained winds near 240 kilometers per hour (150 miles per hour or 130 knots), over the Eastern Pacific Ocean. + High resolution image

This image shows Daniel with tightly spiraling clouds that circle an open eye with near-perfect symmetry: hallmarks of a well-organized storm. At the time, 2:55 p.m. Pacific Daylight Time (21:55 UTC), Daniel was a strong Category 4 storm, its winds just a few knots short of a Category 5 storm. For the Central Pacific Hurricane Center Web site, please visit: http://www.prh.noaa.gov/hnl/cphc/



CloudSat Captures Hurricane Daniel's Transformation

views of Hurricane Daniel

Hurricane Daniel intensified between July 18 and July 23. NASA's new CloudSat satellite was able to capture and confirm this transformation in its side-view images of Hurricane Daniel as seen in this series of images.

The top images are from the National Oceanic and Atmospheric Administration's Geostationary Operational Environmental Satellite (GOES) to give an idea of how the storm looked from the top. The bottom images are from CloudSat.

The first CloudSat image was taken from NASA's CloudSat satellite on July 18 at approximately 5:25 p.m. EDT (21:25 UTC). The second image was taken July 19 at approximately 5:40am EDT (0940 UTC). The third image was taken on July 23 around 650am EDT (1050 UTC).

The red and purple areas indicate large amounts of cloud water. The blue areas along the top of the clouds indicates cloud ice, while the wavy blue lines on the bottom center of the image from July 18 and July 23 indicate intense rainfall. Notice that the solid line along the bottom of the panels from July 18 and July 23, which is the ground, disappears in these areas of intense precipitation. It is likely that in the area the precipitation rate exceeds 30mm/hr (1.18 inches/hour) based on previous studies.

From one side of the storm to the other, on July 18, Daniel appeared to be approximately 700 km. The scale from top to bottom is approximately 30 km, so the clouds in this hurricane reach heights of about 20 km. On July 19, Daniel appears to intensify and became more compact as its maximum sustained winds increased from 75 to 90 mph. By July 23, the winds had intensified to greater than 100 mph.

The CloudSat images shown here will provide analysts and forecasters a view of hurricanes and typhoons that has not been available before. The cross-sections shown in the bottom panels provide a view of the internal dynamics of these storms that gives us important information about the intensity, rainfall rates, and internal temperature fields of these storms, all of which will help forecasters better predict how the storms will intensify or weaken, and what the potential impact might be from rainfall and wind.

Image credit: NASA/JPL/The Cooperative Institute for Research in the Atmosphere (CIRA), Colorado State University/NOAA

+ High-resolution



Hurricane Daniel Crosses Into the Central Pacific

Daniel became the third hurricane to form in the East Pacific so far this year, which is about average for the region. However, it is already the second major hurricane in the East Pacific, well ahead of last year's pace that saw only two for the entire season.

Daniel in the Central Pacific on July 24

On Monday, July 24, Hurricane Daniel was in the central Pacific Ocean, and forecasts were issued from the National Weather Service's Central Pacific Hurricane Center in Honolulu, Hawaii. At 5 a.m. Hawaiian Standard Time (HST), the center of Hurricane Daniel was located near latitude 16.3 north, longitude 140.8 west or about 970 miles east-southeast of Hilo, Hawaii and about 1170 miles east-southeast of Honolulu. Daniel is moving toward the west-northwest near 14 mph. Maximum sustained winds were near 90 mph with higher gusts. Some weakening is forecast during the next 24 hours. Hurricane force winds extend outward up to 30 miles from the center and tropical storm force winds extend outward up to 90 miles. Estimated minimum central pressure is 980 millibars. All interests in and around the Hawaiian Islands should monitor the progress of Daniel this week.

Images from the Tropical Rainfall Measuring Mission Satellite

The NASA/Japan Space Agency's Tropical Rainfall Measuring Mission (TRMM) satellite has been keeping a close eye on Hurricane Daniel's rainfall.

TRMM Hurricane Daniel July 19, 2006 TRMM Hurricane Daniel July 19, 2006 3D image

This first set of TRMM images, taken July 19 at 10:29 UTC (3:29 am PDT) is a top down view of how intense rain was falling. Two instruments on TRMM were used to see the rain falling from different areas of Daniel. The image shows that Daniel is very well-developed and well organized by the tight banding (curvature) in the rain bands (curved areas of thunderstorms) surrounding the center as well as a nearly complete inner eyewall (inner most green arc). There is also an area of intense rain (dark red) within the eyewall. At the time of this image, Daniel was a strong Category 1 hurricane with maximum sustained winds reported at 80 knots (92 mph) by the National Hurricane Center (NHC).

TRMM's Precipitation Radar instrument can see rainfall in a storm from top to bottom. This second image (taken at the same time of the first image) shows how Daniel looks in 3-D. The radar reveals an area of deep convection (rapidly rising air and building thunderstorms) right near the center of Daniel (red tops) that are about 9 miles (15 km) high and associated with the area of heavy rain within the eyewall in the previous image. The presence of such towers can be hint that the storm may get stronger, which did happen. Daniel steadily increased in intensity after these images were taken reaching Category 4 intensity on July 20 with maximum sustained winds of 120 knots (138 mph).

TRMM Hurricane Daniel July 21, 2006 TRMM Hurricane Daniel July 21, 2006 3D image

The final set of images were captured by TRMM at 5:24 p.m. PDT July 20 (00:24 UTC July 21) when Daniel was near peak intensity. The center of Daniel is on the edge in these images. The rain rate image shows that Daniel has two concentric rings of moderate (green) to high (dark red) intensity rain. These two rings are associated with an inner eyewall surrounded by an outer eyewall. This kind of double eyewall structure can occur in mature, intense hurricanes wherein the outer eyewall can contract and replace the inner eyewall.

The final image from the same overpass shows the corresponding 3-D structure of Daniel. The double eyewall is also evident in this image. The area of high (cloud) towers (red tops) that are right along the edge of the image are part of the innermost eyewall. The broader arc of relatively higher cloud tops (also shown in red) are associated with the outer wall. Daniel is expected to gradually turn to the northwest and weaken over cooler waters.

TRMM was placed into service in November 1997, and is a joint mission between NASA and the Japanese space agency JAXA. For more updates on Hurricane Daniel from the Central Pacific Hurricane Center, visit on the Web: + Pacific Hurricane Center

Images Credit: Hal Pierce (SSAI/NASA GSFC) -- Caption Credit: Steve Lang (SSAI/NASA GSFC) and Rob Gutro (GSFC)

Now Hurricane Daniel

Image of Hurricane Daniel from Aqua taken July 18, 2006.


NASA's Aqua satellite has captured Hurricane Daniel on July 18 in the eastern Pacific Ocean just after its transition from a tropical storm. This image, taken at 5:20 p.m. EDT (21:20 UTC) by the Moderate Imaging Spectroradiometer (MODIS) instrument aboard the Aqua satellite clearly shows the spiral motion of Hurricane Daniel.

At 11:00 a.m. EDT (1500 UTC) on Wed. July 19, the National Hurricane Center reported the center of Daniel near latitude11.9 north and longitude 119.6 west. Daniel's current movement was toward the west at 8 mph (7 knots). Minimum central pressure was 975 millibars.

Daniel was packing maximum sustained winds of 97 mph (85 knots) with wind gusts to 120 mph (105 knots), making Daniel just over the fringe of a Category 2 hurricane.



The Eastern Pacific's 4th Tropical Storm Fires Up

Image of Tropical Storm Daniel from TRMM

The Atlantic Ocean remains quiet for now, but the eastern Pacific Ocean continues with its tropical cyclone activity. Over the weekend of July 15, Hurricanes Bud and Carlotta dissipated, and now a new tropical cyclone has been born.

On Monday, July 17, 2006, Daniel, the fourth tropical storm of the season formed and poses no threat to land. The National Hurricane Center reported at 11:00 a.m. EDT that Daniel was located near 12.4 degrees North and 112.2 degrees West. Daniel was moving toward the west at 10 knots (11 mph) and packing maximum sustained winds of 35 knots (40 mph) with gusts to 45 knots (52 mph). Estimated minimum central pressure is 1004 millibars.

This image was created with data from the Tropical Rainfall Measuring Mission (TRMM) satellite. From TRMM has been providing valuable images and information on tropical cyclones around the tropics using a combination of passive microwave and active radar sensors, including the first precipitation radar in space. This image was taken at 10:44 UTC (6:44 a.m. EDT) July 17, 2006

The image to the left is a look at Tropical Storm Daniel from the top down, and shows where the rain is falling in the storm and how strong it's falling (blues and greens). The rates of rainfall are captured using two different instruments on TRMM. Rain rates in the center swath are from the TRMM Precipitation Radar (PR), and rain rates in the outer swath are from the TRMM Microwave Imager (TMI). The numbers on the left of the image are the latitude lines, and the numbers on the bottom represent longitude.

The image to the right shows a side-view of the rains in Tropical Storm Daniel. Because each sideways rectangle is around 200 kilometers (km) or 124 miles and Daniel's rains seem to spread to about 325 km, the rainfall in the storm appears to be as wide as 200 miles. The height that the rain seems to be falling from is as high as 7 kilometers or just over 4 miles high. The image not only shows liquid precipitation (rain) but also frozen precipitation (ice) which occurs higher than the freezing level. In this case most of the precipitation is rain because it is below the freezing level that is at about 6 km (3.7 miles). The advantage of showing frozen as well as liquid precipitation is that it will show the tops of clouds that are much higher than the freezing level.

TRMM will continue to watch as Daniel continues its trek into the open waters of the eastern Pacific, headed away from land. Credit: NASA/JAXA. Caption: Rob Gutro, NASA GSFC. (+ Click to view larger version of this image.)
 
 
Rob Gutro
Goddard Space Flight Center